Operation of the DP/PA Link and the Y Link
8-11
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
8.6 Replacing faulty modules
The table below show the steps necessary to replace a faulty IM 157, a faulty
DP/PA coupler or a faulty Y coupler.
Step Activity
1 Disconnect the power supply of the faulty module.
2 Unplug the bus connector from the PROFIBUS-DP interface of the faulty
module.
Or
Disconnect the PROFIBUS-PA connection of the faulty DP/PA coupler.
3 Replace the faulty module.
4 Connect the bus connector with the PROFIBUS-DP interface of the new
module.
Or
Connect the PROFIBUS-PA interface to the new DP/PA coupler.
5 Connect the power supply of the new module.
Information on compatibility regarding the exchange of modules is found in
Appendix 2.7.
8.7 System changes during operation
8.7.1 System changes in S7 standard operation
The table below shows the steps necessary to add a completely new DP/PA link
together with the underlying PA master system to an existing system during
operation.
Step Activity
1 Install the new DP/PA link.
2 Connect the power supply of all modules.
3 Connect the PROFIBUS-PA to the new DP/PA coupler.
4 Connect the bus connector of the DP master system to the PROFIBUS-DP
interface of the new IM 157.
The overall procedure for making a system change and the prerequisites that must
be met to do so are described in detail in the function manual, System Changes
during Operation via CiR.
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